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By using the flank profile normal method of the plane engagement theory, the characteristic of the conjugate line pattem of the screw-liner pair on the single head single screw hydraulic machinery is investigated, and its geometric curvature, conugate line shape and slide cocfficient are analyzed.

利用平面啮合理论的齿廓法线法研究了单头单螺杆水力机械螺杆－衬套副的共轭线型特征，并对其几何曲率、啮合线形状和滑动系数等基本特性进行了分析。

Owing to the key conclusion, this paper lays emphasis on the possible ways of realizing the singular conjugation by single—enveloping method. It is proved that the hyperbolic normal arc surface and the involute helicoid both may conjugate in singular points on the condition of single—envelope.

在奇点共轭理论的工程实现方面，文中明确指出二次包络是获得奇点共轭的有效手段，但并非唯一手段，在满足特定的运动几何条件下，一次包络即可获得奇点共轭。

It is called the reconstruction of single contour lines if there is only a single contour line in each plane.

如果在相邻两层的平面上，各自只有一条轮廓线，可以称之为单轮廓线的重构问题。

But as Lou Crandall of Wrightson ICAP, a research firm notes, Auctions work well when you have a group of bidders for a single set of identical assets. They work less well when you have a single bidder for a group of disparate assets.

但是一家研究机构Wrightson ICAP的Lou Crandall认为：拍卖在一群竞标人争夺一个单一的资产时比较有用，但是在一个竞标人却又一大堆不同的资产时就不太起作用了。

Based on the foundation of the virtual prototype model of the medium-speed maglev train, using the mechanical dynamics and kinematics analysis software ADAMS, this paper expatiates on the following things. Firstly, it analyses the decouple of single magnetic bogie by the simulation and experimentation; secondly, adds the magnetic levitation control system to the single magnetic bogie model and simulates; thirdly, by simulating the motion of the train running on the different type of guideway, analyses the state of the train on the ramp and crankle;in the end ,this paper does a further research on how the magnetic levitation control system and guideway parameters affect the suspending gap when the train runs on the ramp and crankle .

论文在建立了中低速磁浮列车虚拟样机模型的基础上，借助于机械系统运动学及动力学分析软件ADAMS，首先从单转向架出发，仿真分析了磁浮列车单转向架的解耦能力；接着对单转向架样机模型进行了控制系统的仿真；然后对一辆整车在竖曲线和平曲线的运行在ADAMS中进行了仿真，分析了列车在坡道和弯道上的运行状态；最后对磁浮列车在坡道和弯道上运行时的系统性能进行仿真分析，进一步研究了控制系统和线路参数对磁浮列车悬浮性能的影响。

Single crystals of compounds 1, 2 and 3 were grown and their crystal structures were determined by a single crystal diffraction technique.

培养了化合物1， 2， 3的单晶，并用X射线衍射法测定了它们的晶体结构。

This paper makes further research on the error,caused by use of a single step or a variable step of Runge Kutta to solve the Euler equation of quaternion method, find that the large error results from cumulated error with single step, and when using the variable step,the cumulative error is less.

结果表明，定步长时有很大的累积误差，单位四元数的"单位"性不能得到满足，而变步长有明显的改观，对一般的飞行模拟状态，都能得到较好的模拟结果，可以在实际中使用。

There isn"t obvious selectivity in blank cutworm imperilment, the onseting quantity and imperilling degree is similar on different crops. It"s more serious in the field of invasion of weeds and corn intercrop potato than single cropping of corn, and the field of forecrop green manure is more serious than single cropping. Imperilment degree of black cutworm is very serious in both high altitude region as Dewu (1780 meters) and low altitude region as Lemin (1450 meters). The imperilment degree in two regions have no obvious differences. 4. The imperilment of second generation armyworm is very serious in both high altitude region of Dewu and low altitude of Lemen town.

3小地老虎的为害对品种没有明显的选择性，各品种小地老虎发生量和受害程度相似；作物对小地老虎发生为害程度影响较大，杂草丛生的地块和玉米与马铃薯间作的地块受害程度明显高于玉米净作地块，而前作为绿肥的地块受害程度也比净作高；土壤条件对小地老虎发生为害程度有影响，土质疏松、肥沃、团粒结构良好的地块受害程度明显比地势低洼、土质粘重、瘠薄的地块重；小地老虎在高海拔的德坞(1780米)和低海拔的乐民(1450米)两地发生为害均较重，为害程度没有明显差异。

Martensia was characterized by either single or multiple network-banded blades, procarps consisting of a four-celled carpogonial branch flanked on one side by a single lateral sterile group and on the other side by a group of cover cells, and cystocarp scattered over fertile blades.

此属的特点为藻体膜叶状且膜叶具有单或多层的网状结构，其雌性殖果孢枝特化具有侧边单一的不孕枝而另一边有一群覆盖细胞，果孢子囊散生在藻体各处。

Purpose: To evaluate whether a single-breath hold and single-level test bolus-injection dynamic scanning was a good way of defining the portal contrast media peak time and its preliminary application with spiral CT portography.

目的 ：探讨一次屏气试验剂量团注单层动态扫描是否能很好确定门脉造影剂峰值及其在SCTP成像中的应用价值。

The witness also told the jury at the Royal Courts of Justice in London that he saw a paparazzo fighting with a member of the public who was trying to stop him taking pictures in the minutes before the emergency services arrived.

他还告诉在伦敦皇家法庭的陪审团，在急救服务到来之前，他当时看见一个狗仔队正和一群阻止他拍照的人打架。

The entire N／C program on a tape is made up of an accumulation of these successive data blocks.

纸带上的整个数控程序由这些连续数据单元连接而成。